Overseaming-machine.



PATBNTED JULY 28, 1903.

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TTURNBYS- UNITED STATES Patented .Tully 28, 1553011 PATENT OFFICE.

WILLIAM H. STEDMAN, OF HARTFORD, CONNECTICUT,ASSIGNOR TO MERROW MACHINECOMPANY, OF HARTFORD, CONNECTICUT, A COR- PORATION OF CONNECTICUT.

OVERSEAMING-MACHINE.

SPECIFICATION forming' part of Letters Patent N o. 734,987, dated July28, 1903.

Application filed October 21,1902.

To all whom, t may concern:

Be it known that I, WILLIAM H. STEDMAN, a citizen of the United States,residing at Hartford, county of Hartford, State of Connecticut, haveinvented certain new and useful Improvements in Overseaming-Nlachines;and I do hereby declare the following to be a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, forming a part of this specification, and to the figures ofreference marked thereon.

This invention relates to overseaming-machines and especially to thattype of machines in which the looping or stitch-forming mechanismcomprises three instrumentalitiesviz., a reciprocating thread-carryingneedle, a looper reciprocating horizontally beneath the needle-plate andcooperating with the needle, and a looper having both reciprocatory andoscillatory motion and cooperating with the needle above and thecompanion looper below the needle-plate-a machine oi:` the type referredto forming the subject of Patent No. 591,049, to which reference may behad for a more complete description and illustration of the generalconstruction and operation of such machines than is necessary to begiven herein.

The invention herein has to do particularly with the means forsupporting, securing, andcarrying the loopers, the object of theinvention being to improve the general construction and operation of theportions of the machine to which the improvements relate and thereby toincrease the efciency and facilitate the adjustment and manipulation ofthe machine.

In the accompanying drawings, Figure 1 is a front elevation with themechanism constituting the .present improvements and adjacent portionsof the machines mechanism largely in f ull lines and the outline of theframe and head in dotted lines. Fig. 2 is an end elevation lookingtoward the right, Fig. 1, but with some of the parts omitted to avoidobscurity. Fig. 3 illustrates in plan the means whereby the loopers aresupported, the door or cap of the machine-frame being shown incross-section on the line 3 3 of Fig. 1. Fig. 4L is a front elevation ofthe loopers, their car- Serial No. 128.159. (No model.)

riers, and the cams for operating them, the machine door or cap beingshown in dotted lines. Fig. 5 is a sectional view showing the meanswhereby. the looper supports are assembled and the loopers securedthereto. Fig. 6 is a rear elevation of the oscillating looper support orcarrier. y

Throughout the several gures of the drawings like referencenumeralsindicate the same parts.

In said drawings, 10 indicates the mainframe housing or casing of themachine; 11, the head; 12, the main shaft; 13, the drivingpulley, and14C a s econd'shaft above and parallel with the main shaft. The shafts12 and 14 bear, respectively, cam-cylinderslQa and 11a, havingintermeshing gears 12b and 14 for insuring the unitary rotation of theshafts and cam-cylinders, the latter having the usual cam-grooves 12C14C, whereby the loopers are actuated to cause them to cooperate witheach other and the needle in the operation of overseam-sewing.

The number 10,n indicates the cap for clos= in g an Vopening in theframe 10 through which the interior of the machine may be reached. Thesecond shaft 14 at its cnd'adjacent the machine-head 11 bears aneccentric-pin l5,

connected by a link 16 with the needle-carrier 17, the latter beingpivotally secured to the end wall of the machine-frame. The needle 18 ismounted in the carrier 17 and through the described train of mechanismis recipro= cated in a path concentric with the pivotal support of thecarrier. v

VYThe machine is provided with a needleplate 19, supported beneath thehead 11, and also preferably with a variety of four-motion feed now incommon use and including the presser-foot 20. The feed is driven fromthe main shaft 12, and serrated portions of the feed-dog 21 (partlybroken away in the drawings) operate through openings 19"L in theneedle-'plate 19. Y

The various elements thus far described are substantially the same asthose now in common use in this type of machines and need no furtherdetailed explanation.

Referring now particularly to the parts embodyin gthe present inventionand other parts IOO of the machine closely associated therewith, thenumber 22 indicates the yhorizontally-reciprocating, looper, and 23 thesliding block -in which it is supported and carried. The sliding block23 is formed on its rear face and near one end with an extension or arm23, having a hole 23b therethrough for the reception of thelooper-shank, and the looper is secured in the arm of the sliding blockby the screw 2i. The upper and lower edges of the sliding block arebeveled, as is usual, and the said block is received and adapt-ed toslide longitudinally between beveled gibs 10b l0C on the inner face ofthe door l0, as shown in the Fig. 2.

The number 25 indicates the looper, having bot-h reciprocatory andoscillatory motion, and 26 the support or carrier therefor.

The carrier 2G midway its length has a pivot or stem 26a on one face andon its opposite face an extension or arm 26, radiating' from the axialcenter of the said stem. The arm 261 has a hole 26C therethrough,preferably radiating from and crossing the center of oscillation of thecarrier 26, for the reception of the shank of the looper 25. To securethe looper to the carrier, a set-screw 27, located in a central hole inthe stem 26a and passing through the carrier, is adapted to engage thelooper-shank in the line of its eenter of oscillation.

' The sliding block 23 is provided on its front face with a hub 23, andthe said .block and hub are bored to receive the pivot or stem 26*L ofthe carrier 26 to pivotally support the carrier in the block. (See Fig.5,) IVhen the block and carrier are assembled in the manner described,the arms 23L 26h are in close proximity, and upon the oscillation of thecarrier 26 the arm 26b rocks in a vertical plane parallel with the rea-rface of the arm 23l The sliding block is provided with a projection 29upon its hub, having two holes or thread-eyes intended for the passageof the looper-threads and in connection with the thread-guides 2.()ftserves as a take-up upon the reciprocation of the sliding block.

' The carrier 26 is provided with the usual pins 26, upon which thereare mounted rollers 28 28, adapted to enter, respectively, thecamgrooves 14 l2c in order that upon the rotation of the cams l2a 14 thesliding` block and the carrier shall be reciprocated longitudinally inunison and simultaneously with such movement the carrier shall be rockedon its pivotal support to cause the loopers 22 25 to cooperate with eachother and the needle in the manner before explained and well understood.

The cap lOlL is recessed on its rear face, as at 10(1,to accommodate thehub 23b of the sliding block 23, and the bottom wall of the said recessis cut through or slotted, as at 10C, to permit the take-up 29 toproject therethrough. A

To enable the set-screws 24 27 to be readily reached'for manipulation,an opening 'lOf is provided through the door 10, with which both thesaid screws register at given points in the travel of the sliding block.In Fig. 1 the said opening is shown as an enlargement at one end of theslot 10C.

The manner of supporting the oscillating looper carrier at its center ofoscillation is particularly advantageous in that it permits lightness ofconstruction of the portion of the carrier remote from its said centerof oscillation, where the oscillatory movement is greatest, and permitsa pivotal bearing of greater proportionate length than heretofore in aconvenient form for grinding to t, and,

furthermore, the screw for fastening the looper in this carrier islocated at a point especially accessible where there is no verticalmovement of the parts.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In an overseaming-niachine, the combination of a needle, alooper-carrier adapted for oscillatory and reciprocatory motion andhaving a passage crossing its center of oscillation to receive alooper-shank, a set-screw at said center to secure the looper to thecarrier, a block or carriage on which the carrier is pivotallysupported, a looper supported in the carrier and alooper supported inthe block, means for supporting the block and means for oscillating thecarrier and reciprocating the same and the block in unison, to cause theloopers to coact with each other and with the needle; substantially asdescribed.

2. In an overseaming-machine, the combination of stitch-formingmechanism including a needle and two loopers cooperating therewith andwith each other and having respectively combined reciprocatory andoscillatory motion and reciprocatory motion, a carrier for thereciprocating and oscillating looper having a pivotal stem and aset-screw located therein to engage the looper-shank at the center ofits oscillation, a block supporting the reciprocating looper and havinga hub to receive the pivotal stem of the carrier, means for supportingthe block and means for actuating the carrier and block, substantiallyas described.

3. In an overseaming-machine, the combination of stitch-formingmechanism including a needle and two loopers cooperating therewith andwith each other and having respectively combined reciprocatory andoscillatory motion and reciprocatory motion, a carrier for thereciprocating and oscillating looper having a pivotal stem, a blocksupporting the reciprocating looper and having a hub to receive the stemof the carrier, a take-up carried by the said hub and means foractuating the carrier and the block; substantially as described.

4. In an overseaming-machine, the combination of stitch-formingmechanism including a needle and two loopers cooperating therewith andwith each other and having respec- ICO tivelyoombined reoiprooatory andoscillatory for actuating the carrier and the block; submotion zuidreciprooatoly motion, a, carrier'. stantially as described.

for Jshe reciprocating and oscillating loopei' i having L pivotal stem,ablock supporting the WILLIAM n' STEDMAN' ieoipiiocatng looper andhaving a hub to re- Vitnesses:

ceive the stem of the carrier, a take-up \V. A. W. STEWART,

formed on one side of the saidliub and means ALONZO M. LUTHER.

